Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 486 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 86 × 65 = 5590 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 65 × 14 = 908 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 78 × 60 = 4680 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 79 × 63 = 4979 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 24 × 17 = 414 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 78 × 87 = 6786 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 41 × 51 = 2091 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 644 + 823 = 1472 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 31 × 33 = 1023 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 468 + 923 = 1395 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 51 × 41 = 2091 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 822 + 581 = 1403 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 31 × 77 = 2387 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 399 + 837 = 1236 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 762 + 843 = 1603 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 815 + 598 = 1413 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 24 × 88 = 2105 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 27 × 98 = 2651 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 29 = 600 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 429 + 431 = 860 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 48 × 29 = 1392 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 27 × 39 = 1053 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 22 = 291 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 71 × 60 = 4259 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 60 × 86 = 5169 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 39 = 1295 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 84 × 16 = 1344 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 14 × 51 = 714 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 47 × 12 = 564 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 617 + 342 = 959 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 16 × 25 = 400 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 98 × 72 = 7056 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 63 × 80 = 5040 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 934 + 479 = 1413 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 470 + 724 = 1194 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 91 × 27 = 2448 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 34 × 57 = 1938 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 975 + 118 = 1096 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 49 × 90 = 4410 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 957 + 994 = 1951 right or wrong? (a) Right (b) Wrong

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